| 摘要 |
A sigma-delta modulator. The sigma-delta modulator comprises a summer, a loop filter, a quantizer, a D/A converter and a dynamic element matching logic. The summer receives an analog input signal and a feedback signal to generate an error signal to the loop filter which generates a filtered signal to the quantizer, thereby converting the filtered signal to a quantized output signal to the D/A converter including D/A elements and generating the feedback signal corresponding to selected D/A elements thereof. The dynamic element matching logic coupled between the quantizer and D/A converter selects the D/A elements of the D/A converter, wherein it divides the D/A elements into groups, where the number of the groups is prime to that of the D/A elements, and then selects the groups and D/A elements thereof according to the quantized output signal and the previous selection of groups and D/A elements.
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